OLEDs doped with phosphorescent compounds

Abstract

Organic light emitting devices are disclosed which are comprised of a heterostructure for producing electroluminescence wherein the heterostructure is comprised of an emissive layer containing a phosphorescent dopant compound. For example, the phosphorescent dopant compound may be comprised of platinum octaethylporphine (PtOEP), which is a compound having the chemical structure with the formula:

1. An organic light emitting device comprising a single or double heterostructure comprising an emissive layer,
 wherein the emissive layer is a charge carrying layer comprising a charge carrying material and a phosphorescent material, wherein the phosphorescent material is present at a lower concentration than the charge carrying material, and wherein the phosphorescent material is capable of capturing exciton triplet energy from the charge carrying material, and 
 wherein the phosphorescent material emits phosphorescent radiation from a triplet molecular excited state when a voltage is applied across the device. 
 
     
     
       2. The device of  claim 1 , wherein the emissive layer is a hole transporting layer. 
     
     
       3. The device of  claim 1 , wherein the emissive layer is an electron transporting layer. 
     
     
       4. The device of  claim 1 , wherein the phosphorescent material is capable of a photoluminescent quantum yield greater than 50 percent in the solid state. 
     
     
       5. The device of  claim 1 , wherein the phosphorescent material has a phosphorescent lifetime of no longer than 10 microseconds. 
     
     
       6. The device of  claim 1 , wherein the phosphorescent material emits phosphorescent radiation from a triplet molecular excited state at room temperature. 
     
     
       7. The device of  claim 1 , wherein the phosphorescent material has the chemical structure of formula I: 
       
         
           
           
               
               
           
         
         wherein X is C; R 8,  R 9,  and R 10  are each independently selected from the group consisting of hydrogen, alkyl, substituted alkyl, aryl and substituted aryl; R 9  and R 10  may be combined together to form a fused ring; M1 is Pt; a is 1; b is 0; and c is 1. 
       
     
     
       8. The device of  claim 7 , wherein the phosphorescent material is platinum octaethylporphine and has the chemical structure with the formula: 
       
         
           
           
               
               
           
         
         wherein Et is an ethyl group. 
       
     
     
       9. The device of  claim 1 , wherein the device is incorporated into an optoelectronic device. 
     
     
       10. The device of  claim 9 , wherein the optoelectronic device is incorporated into one of a vehicle, a computer, a television, a printer, a large area wall, a theater or stadium screen, a billboard, or a sign. 
     
     
       11. An organic light emitting device, comprising an anode, a cathode, and an emissive layer between the anode and the cathode, wherein the emissive layer comprises a phosphorescent material and a charge carrying host material, wherein the phosphorescent material is capable of a photoluminescent quantum yield greater than 50 percent in the solid state, and the phosphorescent material emits phosphorescent radiation from a triplet molecular excited state at room temperature when a voltage is applied across the organic light emitting device. 
     
     
       12. The device of  claim 11 , wherein the emissive layer is a hole transporting layer and the charge carrying host material transports holes. 
     
     
       13. The device of  claim 11 , wherein the emissive layer is an electron transporting layer and the charge carrying host material transports electrons. 
     
     
       14. The device of  claim 11 , wherein the phosphorescent material has a phosphorescent lifetime of no longer than 10 microseconds. 
     
     
       15. The device of  claim 11 , wherein the device is incorporated into an optoelectronic device. 
     
     
       16. The device of  claim 15 , wherein the optoelectronic device is incorporated into one of a vehicle, a computer, a television, a printer, a large area wall, a theater or stadium screen, a billboard, or a sign.